Head Exhaust Pipes

If I am purchasing a 67 headpipe to mount to a 68 manifold, should I use the flange and donut gasket for the 64-67 or 68-70?
 
The 68 exhaust manifold outlet is larger than the 67 on back.
You might want to use a 68 headpipe to take advantage of the larger manifold.
I believe there is a 1/4" difference in diameter of the manifold outlet & the 68 headpipe.
I would take advantage of the extra pipe diameter of the 68. Bill
 
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